JPH0230542B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Technical Field of the Invention The present invention provides a method for retrieving information with limited use, and more particularly, a system for retrieving information that is limited in use, and more particularly, provides a user with a method for retrieving information that has limited use. The present invention relates to an information retrieval method whose use is restricted in some cases where one copy is restricted.

Prior Art and Problems When storing a table consisting of units of information groups identified by key codes in memory and restricting the use of a portion of the table depending on the user, conventionally, the first An information retrieval method as shown in the figure was known.

In Figure 1, MEM is a memory, C is a collation unit, CHE is a judgment unit, KR is a key code storage register, IDR is a register that stores the user's identification code ID, IK is the key code, and the user's identification code. sign
This is an input key device for inputting ID, etc.

In the memory MEM, key codes K ₁ , K ₂ -K _o are set for each address area of a fixed size, and the above address areas corresponding to the key codes K ₁ , K ₂ -K _o , that is, , each key code
In the address area following K ₁ , K ₂ to _{K o} , there is a unit of information group identified by the key code K ₁ , K ₂ to _{K o}
IU ₁ , IU ₂ to IU _o are stored. Each key code K ₁ , K ₂ to _{K o} has additional information TAG ₁ ,
TAG ₂ to TAG _o are added.

In verification section C, ADG is an address generation circuit,
COMP is a comparison circuit.

By inputting a key code (one of K ₁ , K ₂ to _{K o} ) from a user, a unit of information group identified by the key code input by the user, such as a key When the use of the information in the information group unit IU ₁ for code K ₁ is permitted, the information in the information group unit is read out from the memory MEM and made available to the user, but the user If the use of the information is not permitted, the information will not be read and cannot be used.

Next, the operation will be explained with reference to FIG. The user inputs, as search information, a key code that identifies the unit of the information group that he or she wishes to use from the input key device IK, and also inputs the user's identification code ID. The user's identification code ID can be entered by hitting the keys on the input key device IK, but it is also possible to insert the user identification card into the input device (not shown) and read the magnetically recorded code. It can also be input by

The input key code _Kn is temporarily stored in the key code storage register KR. The input user identification code ID is stored in the user identification code register ID.

When the key code and user identification code are input as described above, the verification section C starts operating.
The address of the first key code _K1 is generated from the address generation circuit ADG and given to the memory MEM as address data (AD), and a read instruction is also given to the memory MEM. The key code K ₁ and additional information TAG ₁ are read as read data RD, and the comparison circuit COMP
input into one of the input sections. The user identification code storage register IDR outputs “1” to the output terminal O ₁ when the user identification code is stored, and therefore the AND gate AG ₂ is conductive, so the contents of the key code storage register KR are is input to the other input section of the comparison circuit COMP, and the comparison circuit COMP compares the contents of the key code storage register KR input by the user with the key code just read from the memory MEM.

If they do not match, the match signal (CI) is “0” indicating a mismatch, and this is the address generation circuit.
Key code K ₁ given to ADG and just sent out
Create the address of key code K ₂ by adding α (difference between the addresses of adjacent key codes K ₂ ) to the address of , and store it in memory as address data AD.
Send to MEM and give reading instructions.

The key code _K2 is read in the same manner as above, and a comparison is made in the comparator circuit COMP.
If they do not match, the above operations are repeated, and the key codes K ₂ - are sequentially compared with the contents of the key code storage register to perform a search.

Now, in the comparison circuit COMP, the contents of the key code storage register KR (K _n ) and the memory MEM
If it is detected that the key code read from
becomes. Address generation circuit ADG receives this signal and temporarily stops its operation.

The judgment unit CHE also detects the coincidence signal (CI) as “1”.
Then, input the above key code (K _n ) read out from the memory MEM, its additional information TAG _n , and the user identification code stored in the user identification code storage register IDR, and click here. When it is determined that the user is permitted to use the unit IU _n of the information group identified by the key code K _n by performing a logical operation, "1" is output as the determination signal S. Ru.

The address generation circuit ADG restarts its operation upon receiving this output "1", and switches the output of the address of the key code K _n , which has already been created and sent out but is stored, from the +α circuit to the +1 circuit, 1 by 1. Obtain sequentially increasing address data and key code
The information of the unit IU _n of the information group identified by K _n is sequentially read one by one and sent out as read data (RD). On the other hand, since the AND gate AG ₁ is conductive due to "1" of the judgment signal S, the information read as the above read data (RD) is output to the output terminal.
Output sequentially to _O2 .

Further, when the determination unit CHE determines that the user is not permitted to use the unit of the information group, "0" is output as the determination signal S.

Address generation circuit ADG does not restart its operation as a result of receiving this output "0". Further, this output "0" is also given to the AND gate _AG1 , and since it is non-conductive, no output is generated at the output terminal _O2 .

As described above, the conventional technology adds additional information to the key code to determine whether or not the use of the unit of information group identified by the key code input by the user is permitted. This was done through complex logical calculations between three elements: a key code stored in memory and read, additional information, and a user identification code.

For this reason, it is not only necessary to add extra additional information (TAG ₁ ~), but also a complicated judgment logic is required to determine whether or not a unit of information group is eligible to use, which has the disadvantage of complicating the equipment and processing. It was hot.

OBJECT OF THE INVENTION The present invention obviates the above-mentioned drawbacks of the prior art and
The purpose is to simplify the necessary equipment and processing when searching for information when some users are restricted from using a table consisting of units of information groups identified by key codes. do.

Embodiments of the Invention Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

FIG. 2 is a block diagram showing connections in one embodiment of the present invention. In Figure 2, MEM is memory,
C is the collation unit, K-CONV is the key code conversion unit,
KR is a key code storage register, IDR is a register that stores user identification code ID, IK is an input key device for inputting key code and user identification code ID, etc., and AG and OG are AND registers, respectively.
Gate and or gate.

The memory MEM has a similar configuration to the memory MEM shown in FIG. In the memory MEM, key codes K ₁ , K ₂ ~
K _o is set in the address area corresponding to the key codes K ₁ , K ₂ -K _o , that is, in the address area following the address where each key code K ₁ , K ₂ -K _o is stored. Information group units IU ₁ , IU ₂ -IU _o identified by key codes K ₁ , K ₂ -K _o are stored. Unlike Fig. 1, key codes K ₁ , K ₂
No additional information is added to ~K _o . Key·
Regarding the addresses for storing the codes K ₁ , K ₂ to _{K o} , it is assumed that the address of a certain key code K _p is always larger than the address of the previous key code K _p-1 by a fixed number α. Therefore, the unit of information group IU _p-1 identified by the key code K _p-1 has α pieces of information accessible by α addresses.

The user inputs a key code that identifies the unit of information group that he/she wants to use from the input key device IK, and also inputs the user's identification code ID. The user's identification code ID may be entered by pressing a key on the input key device IK, but an ID card with the user identification code ID magnetically recorded may be prepared and this ID
This can also be done by inserting the card into an input device (not shown) and magnetically reading and inputting the card.

When a certain user inputs a key code and user identification code that identifies a desired unit of information group, the user is permitted to use the unit of information group identified by the key code. If so, the information in the unit of the information group is read out and used, but if it is not permitted, reading is prohibited.

Next, the operation of the embodiment shown in FIG. 2 will be explained.

A key to identify the units IU ₁ , IU ₂ to IU _o of the information group.
The codes K ₁ , K ₂ ~ _{K o} are expressed as a combination of hexadecimal numbers,
When each digit is encoded with an ISO code, it is in an active state (indicated by K _1a , K _2a to K _oa ), and when it is encoded with a binary code, it is in an inactive state (K _1a , K _2o ,
Indicated _by Koo. ). Here the hexadecimal number is 0
~9, A to F. For example, if IDF is used as a key code, each number that makes up this key code is an ISO code in the active state, I is 00110001, D is 01000100, F is 01000110
The key code IDF is 00110001, 01000100, 01000110 in the active state.
In the inactive state, the key code is represented by a binary code, I is 0001, D is 1101, F is 1111, and the key code IDF is in the inactive state.
Represented by 0000, 0000, 0000, 0001, 1101, 1111.

Memory MEM contains all key codes K ₁ ,
Key code in active state as K ₂ ~ _{K o}
K _1a , K _2a to K _oa are stored, and when searching, the key code in the active state is input from the input key device IK for the search, and the key code in the active state is input to the key code storage register KR. Assume that the key code is stored.

Now, in Figure 2, the user identification code ID is stored in the user identification code storage register IDR, and the key is also stored in the user identification code storage register IDR.
When the key code for search is stored in the code storage register KR, the key code converter K-
CONV is started. The key code converter K
- CONV has the configuration shown in Figure 3, CON ₁ is a circuit that converts the key code from an active state to an inactive state format, CON ₂ is a circuit that also converts the key code from an inactive state to an active state format, and SW ₁ , _SW2 are interlocking changeover switches, and ADG' is an address generation circuit. When the key code conversion unit K-CONV is written,
As shown in Figure 2, the user identification code storage register
From the IDR, the user identification code stored here is passed through the input terminal _t4 to the key code converter K-
CONV address generation circuit ADG' (see Figure 3)
Enter. The address generation circuit ADG' interprets the identification code and checks whether there is a key code that the user of the identification code is not allowed to use;
If there is, an address where the key code is stored is created and sent as address data (AD) from the output terminal _t1 , and a read instruction is issued. The above address data is sent to the memory MEM via the OR gate OG.

Through the above operation, the memory MEM receives the address and read instruction of one key code (for example, K ₂ ), so the key code is read from the address.
Read K ₂ and send it as read data (RD).

Key code converter K-CONV is memory MEM
The key code is received as read data (RD) at the input terminal _t2 , and is input to the conversion circuit _CON1 via the changeover switch _SW2 , and the key code is
Converts K ₂ from its active state K _2a to inactive state K _2o and sends it to the memory MEM as write data (WD) from output terminal t ₃ via changeover switch SW ₁ ,
Even after issuing a write instruction, the original key code still being sent from the address generation circuit ADG'
Write to address _K2 .

In this way, the key code identifying the unit of the information group whose use is not allowed to the user is converted into an inactive state in the memory MEM. If there are further units of the information group whose use is not permitted, the same process is performed after the above process is completed to convert the corresponding key code to an inactive state.

As described above, when all key codes that identify units of information groups that the user is not permitted to use are rewritten to the inactive state in the memory MEM, the collation unit C is activated and the The address of the first key code _K1 is generated from the address generation circuit ADG and given to the memory MEM via the OR gate OG as address data (AD).
Also, a read instruction is given to the memory MEM, so the first key code _K1 is read as read data (RD) of the memory MEM, inputted to the comparator circuit COMP of the collation section C, and stored in the key code storage register KR. is compared with the key code stored in .

If they do not match, the match signal (CI) is “0” indicating a mismatch, and this is the address generation circuit.
Creates and sends the address of the second key code _K2 obtained by adding α to the address of the first key code _K1 that has just been sent out, which is given to the ADG, and also sends a read instruction. .

In the same way as above, the key code _K2 is read from the memory MEM and compared in the comparator circuit COMP. If there is a mismatch, the above operation is repeated, and the third and subsequent key codes are compared in sequence. be done.

But now, for example, the second key code
When comparing _K2 and the contents of the key code storage register KR, if a match is detected, the match signal (CI) becomes "1" indicating a match. Address generation circuit ADG receives this signal and switches its operation. That is, the address output is switched from the +α circuit that increases by α to the +1 circuit that increases the address output by 1, so that addresses that increase by 1 are sequentially generated, and the unit of information group identified by the key code K ₂ Read the information in IU ₂ sequentially in address order.

At this time, since the AND gate AG is conductive due to the coincidence signal (CI) being "1", the unit of the information group identified by the key code _K2 that is sequentially read out as described above. The information in IU ₂ is
AND gate as read data (RD)
It passes through AG and is output to the output terminal Out.

In the above search, if the comparison circuit COMP does not detect a match, the information in the memory MEM is not output to the output Out.

In FIG. 2, the key code converter K-CONV instructs a certain user to use the information of the unit IU ₂ of the information group identified by the identification code, for example, the key code K ₂ . If it is determined that it is not allowed, the memory
Since the key code _K2 in the MEM has been converted from the active state to the inactive state, the user specifies the key code _K2 and the key code is stored in the key code storage register KR. Even if the comparator circuit COMP is
Although they are codes, one is in an active state and the other is in an inactive state, so a match cannot be detected, and the key code _K2 is excluded from the search target, and the key code _K2 is identified by the key code K2. unit of information group
IU ₂ information cannot be used.

As described above, the information in the units IU ₁ , IU ₂ to _{IU o} of the information group is rendered unusable by deactivating the key code that identifies the unit of the information group.

It is assumed that the input key device IK sends out ISO code information in response to input information.

As described above, when the search is completed and this is detected, for example by the user pulling out the user identification card, the inactive key code is returned to the active state in the memory MEM.

That is, in the key code converter K-CONV, the changeover switches SW ₁ and SW ₂ are switched, and the address generation circuit ADG' performs the same process as described above to input data from the user identification code storage register IDR via the input terminal _t4 . Generating an address of a key code that is not permissible for the user based on the input identification code of the user, and reading the key code in an inactive state as read data (RD) using this address; A circuit that converts the key code from inactive to active form via input terminal t ₂ and switched switch SW ₂
input it to CON ₂ and convert it to the active state here,
It is sent to the memory MEM as read data (WD) via the switched switch SW ₁ , and written to the above address. Through this process, all the key codes in the memory MEM that were in an inactive state are returned to an active state.

In this way, the device returns to its resting state and is ready for the next use.

However, if the same user wants to search again using a different key code, for example, before the user pulls out the user identification code card, If you type in a new key code while the key code that is not allowed to be used is still inactive, the key code will be rewritten immediately without the need to rewrite the key code in the memory MEM.
A search by code is performed. In this way, the time required to search for multiple key codes by the same user is reduced.

The present invention is not limited to the embodiments described above, and various modifications can be made within the technical scope thereof.

Effects of the Invention Since the present invention is configured as described above,
If the use of a table consisting of a unit of information group identified by a key code is partially restricted depending on the user, a conventional There is no need to add extra additional information as in the technology of This eliminates the need for complex decision logic and decision processing, and also has the effect of shortening the search time when the same user searches for a plurality of key codes.

[Brief explanation of drawings]

FIG. 1 is a block diagram showing the connection configuration of an information retrieval method according to the prior art, FIG. 2 is a block diagram showing the connection configuration of an embodiment of the present invention, and FIG. 3 is a key code of the embodiment of FIG. 2. FIG. 2 is a block diagram showing an example of the configuration of a conversion unit K-CONV. MEM...Memory, C...Verification section, K-CONV
...Key code converter, KR...Key code storage register, IDR...User identification code storage register, IK...Input key device, AG...And gate, OG...Or gate, K _{1 , K2〜Ko} ……
Key code, IU ₁ , IU ₂ ~ _{IU o} ... Unit of information group, CON ₁ ... Circuit that converts the key code from active state to inactive state format, CON ₂ ... Key code
A circuit that converts code from inactive to active form.

Claims (1)

[Claims] 1. An active key code composed of a combination of codes obtained by encoding hexadecimal numbers (0-9-A-F) using ISO codes, and a key code identified by the key code. The key in the active state is composed of a memory MEM that stores a table consisting of units of information groups, and a code obtained by encoding the hexadecimal numbers (0 to 9 to A to F) using ISO code.・Conversion circuit that converts the code into an inactive key code obtained by encoding each of the above hexadecimal numbers with a binary code
CON ₁ and the input user's identification code ID are interpreted, and it is checked whether there is a unit of information group that the user of the identification code is not allowed to use, and if there is, the information group is Create the address of the above memory MEM where the identifying key code is stored,
A key generator comprising an address generation circuit ADG' which reads out the activated key code stored at the address, converts it into an inactive key code by the conversion circuit CON ₁ , and writes the converted key code to the address. It is equipped with a code conversion section K-CONV, an address generation circuit ADG, and a comparison circuit COMP, and the key code conversion section K-CONV generates a key code that identifies a unit of information group that the user is not allowed to use. is activated when all are rewritten to the inactive state in the memory MEM, and the address generation circuit ADG generates the address of the first key code, reads it from the memory MEM to the comparison circuit COMP, and sends it from the user. Compare it with the input active key code, and if there is a mismatch, perform the above operation on the next key code in sequence, and if they match, the unit of information group identified by this matched key code. An information retrieval method with usage restrictions, characterized in that it has: a collation unit C that sends out an address of information in the address generation circuit ADG from the address generation circuit ADG, reads the information, and outputs it.